Walter e



(No Model.)

W. 'E. HARRINGTON.

ELECTROMAGNETIC GOIL.

No. 580,276 Patented Apr. 6, 1897.

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UNITED STATES PATENT CFFIQE.

IVALTER E. HARRINGTON, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE CUTTER ELECTRICAL AND MANUFACTURING COMPANY.

ELECTROMAGNETIC COIL.

SPECIFICATION forming part of Letters Patent No. 580,276, dated April 6, 1897.

Application filed January 15, 1896 Serial No. 575,590- (No model.)

To aZZ whom it may concern.-

Be it known that I, WALTER E. HARRING- TON, a citizen of the United States, residing in the city and county of Philadelphia, in the State of Pennsylvania, have invented a new and Improved Electromagnetic Coil, of which the following is a true and correct description, reference being had to the drawings which accompany this specification and form IO a part thereof.

My invention relates to the construction of the coils of electromagnets, especially, if not exclusively, to the coils of solenoid-magnets, my object being to provide a coil which can I 5 be constructed so as to have at the same time a spiral Winding of considerable cross-see tional thickness and small central opening.

My further object is to provide a coil which can be easily and cheaply constructed and in which the metal of the coils will be so disposed as to take as little room as possible.

The nature of my improvement will be best understood as described in connection with the drawings, in which it is illustrated, and

2 5 in WlllOl1 Figure 1 is an elevation, partly in central section, showing a coil constructed in accordance with my invention; and Fig. 2, a plan view of the said coil.

0 A indicates a slab to which the coil is shown as affixed by means of attachments C C, B indicating the coil itself, which in accordance with my invention is made of two or more separate bars coiled one upon the other, as

indicated at b b b. In this method of construction the inner bars practically serve as mandrels upon which the outer bars are coiled, each bar being free in the course of manufacture to adjust itself upon the bar beneath,

and thus the distortion of the metal neces- 4o sarily due to its coiling is only such as each bar would receive, while if the spiral windings were made of bars having the thickness of two or more bars the distortion would be much greater, the metal upsetting on the innor side and drawing out 011 the outer side. By using the series of bars, however, the distortion is but small and the coils come and do lie close together, presenting the appearance of rectangular sections.

lVhile of course it is possible to use bars of various sections, I greatly prefer to employ rectangular bars I), and have found it advisable to use bars of nearly square section, as indicated in the drawings.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. An electromagnetic coil having radially deep and axially narrow composite windings said composite windings being made up of two or more separate bars connected in multiple and the outer one or ones being coiled on those next within to form the composite windings as specified. 6

2. A11 electromagnetic coil having radially deep and axially narrow composite windings, said composite windings being made up of two or more separate bars, each of substantially rectangular form connected in multiple 7e and the outer one or ones being coiled on these next within to form the composite windings as specified.

"WALTER E. HARRINGTON.

Witn esses:

OI-rAnLns F. ZIEGLER, D. IIAWARTH. 

